Simulation complete via $finish(1) at time 1110 NS + 0Ĭlock_gen #(.FREQ(50000). run as long as the clocks are turned on. Achieve duty cycle by a skewed clock on/off time and let this allow enough time to complete the current clock periodĪlways (posedge enable or negedge enable) begin correct delay for the configured phase. When clock is enabled, delay driving the clock to one in order $display("START_DLY = %0.3f ns", start_dly) But it cannot be said that the 2 GHz CPU is two times faster than the 1. If your friend has a CPU which clock rate is 2 GHz, then your friend’s CPU’s clock speed is twice of your CPU’s. Real clk_pd = 1.0/(FREQ * 1e3) * 1e9 // convert to ns The speed of a CPU is the rate at which a CPU can complete a processing cycle. When multiple clocks are controlled by a common enable signal, they can be relatively phased easily. The module has an input enable that allows the clock to be disabled and enabled as required. The following Verilog clock generator module has three parameters to tweak the three different properties as discussed above. This will bump up the clock period to 1.563 which actually represents 639795 kHz ! Hence simulation will round off the last digit to fit into the 3 point timescale precision. For example, if the frequency of the clock is set to 640000 kHz, then its clock period will be 1.5625 ns for which a timescale precision of 1ps will not suffice because there is an extra point to be represented. Hence it is important that the precision of timescale is good enough to represent a clock period. Simulations are required to operate on a given timescale that has a limited precision as specified by the timescale directive. For example, another clock of the same time period that is shifted to the right by 1/4th of its period can be said to be at 90 deg in phase difference. If one cycle of a clock can be viewed as a complete circle with 360 deg, another clock can be relatively placed at a different place in the circle that occupy a different phase. The amount of time the clock is high compared to its time period defines the duty cycle. And hence the clock period is the time taken to complete 1 cycle. The frequency indicates how many cycles can be found in a certain period of time. The key properties of a digital clock are its frequency which determines the clock period, its duty cycle and the clock phase in relation to other clocks. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types.Introduction What is Verilog? Introduction to Verilog Chip Design Flow Chip Abstraction Layers Data Types Verilog Syntax Verilog Data types Verilog Scalar/Vector Verilog Arrays Building Blocks Verilog Module Verilog Port Verilog Module Instantiations Verilog assign statements Verilog assign examples Verilog Operators Verilog Concatenation Verilog always block Combo Logic with always Sequential Logic with always Verilog initial block Verilog in a nutshell Verilog generate Behavioral modeling Verilog Block Statements Verilog Assignment Types Verilog Blocking/Non-blocking Verilog Control Flow Verilog if-else-if Verilog Conditional Statements Verilog for Loop Verilog case Statement Verilog Functions Verilog Tasks Verilog Parameters Verilog `ifdef `elsif Verilog Delay Control Verilog Inter/Intra Delay Verilog Hierarchical Reference Verilog Coding Style Effect Gate/Switch modeling Gate Level Modeling Gate Level Examples Gate Delays Switch Level Modeling User-Defined Primitives Simulation Verilog Simulation Basics Verilog Testbench Verilog Timescale Verilog Scheduling Regions Verilog Clock Generator System Tasks and Functions Verilog Display tasks Verilog Math Functions Verilog Timeformat Verilog Timescale Scope Verilog File Operations Code Examples Hello World! Flops and Latches JK Flip-Flop D Flip-Flop T Flip-Flop D Latch Counters 4-bit counter Ripple Counter Straight Ring Counter Johnson Counter Mod-N Counter Gray Counter Misc n-bit Shift Register Binary to Gray Converter Priority Encoder 4x1 multiplexer Full adder Single Port RAM Verilog Pattern Detector Verilog Sequence DetectorĬlocks are fundamental to building digital circuits as it allows different blocks to be in sync with each other. You can find metric conversion tables for SI units, as well as English units, currency, and other data. It is named in honour of the German physicist Heinrich Rudolf Hertz who made some important contributions to science in the field of electromagnetism.Ĭ provides an online conversion calculator for all types of measurement units. The hertz (symbol Hz) is the SI unit of frequency. The SI prefix "giga" represents a factor of You can do the reverse unit conversion fromĬycle/second to GHz, or enter any two units below: Enter two units to convert From:
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